I believe the logic was that "google.com" always does the redirect, because people tend to type google.com manually into their address bar a lot. Google has never bothered to set up any other redirects itself.
Other services that Google has acquired, though (e.g. Blogger, Youtube, etc.) may have come pre-set-up with redirection logic, and Google has mostly left that untouched.
Other services that Google has acquired, though (e.g. Blogger, Youtube, etc.) may have come pre-set-up with redirection logic, and Google has mostly left that untouched.